your first statement with the fuel, suggests you may need to switch to reserve, and see if it flows fuel from there. it should be a constant flow of fuel.

 

uh this is usuallly not recommended, but try dumping a SMALL smount fo fuel down each carb, see if it runs then.

 

I already tried fuel in the carbs, I got it to start that way, but it wouldn't keep running (no more fuel coming in, I guess, but I can't be totally sure that's the reason)

As for the reserve, I can try that, but as far as I know the petcock hasn't worked since I got the bike, the fuel flow never stops no matter what it is turned to...I'll try again with the hoses off just to see what the flow is like though, I'm not quite sure what it will be like.

What exactly is the difference between 'On' and 'Reserve' for the petcock anyways?

 

I normally spray gasoline into the carbs with a small CLEAN spray bottle when I am testing out various things ... this allows the bike to keep running.

 

difference between ON and RESERVE is the height of the pickup. the reserve pickup is at THE bottom of your tank, ON is a good bit higher.

this is going to sound VERY stupid, but is there actually fuel in your tank?